Citation: Wei Zhu, Zhou Tian, Rui-hua Cheng, Xue-lian He, Zhen Liu, Ning Zhao, Bo-ping Liu. Exploring Si/Mg Composite Supported Ziegler-Natta Ti-based Catalysts for Propylene Polymerization[J]. Chinese Journal of Polymer Science, ;2017, 35(12): 1474-1487. doi: 10.1007/s10118-017-1999-1 shu

Exploring Si/Mg Composite Supported Ziegler-Natta Ti-based Catalysts for Propylene Polymerization

Wei Zhu ^a ,
Zhou Tian ^b,, ,
Rui-hua Cheng ^a ,
Xue-lian He ^a ,
Zhen Liu ^a ,
Ning Zhao ^a ,
Bo-ping Liu ^a,,

a.
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
b.
Key Laboratory of Advanced Control and Optimization for Chemical Processes, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Corresponding author: Zhou Tian, tianzhou@ecust.edu.cn Bo-ping Liu, boping@ecust.edu.cn
Received Date: 22 April 2017
Revised Date: 22 June 2017
Accepted Date: 23 June 2017

Fund Project: the National Natural Science Foundation of China 21406061the National Natural Science Foundation of China 21674036the Major State Basic Research Development Program of China 2014CB239503

A series of (SiO₂/MgO/ID/MgCl₂)·TiCl_x Ziegler-Natta catalysts for propylene polymerization has been prepared with a new method. These catalysts were synthesized using soluble Mg-compounds as the Mg-source and the preparation progress was relatively simple. The catalyst could copy the spherical shape of the carrier very well. The propylene polymerization results showed that the catalyst revealed the best activity with 9, 9-di(methoxymethyl)fluorene (BMMF) as internal donor at 50 ℃ with the optimal molar ratio Al/Ti=5, which was much lower than what the industrial polypropylene catalyst used (at least molar ratio Al/Ti=100), resulting in great cost saving. Additionally, the polymerization kinetics of the catalyst exhibited very stable property after achieving a relatively high value. These catalysts possessed rather high activity and good hydrogen response. The isotactic index (Ⅱ) value of the PP products could be higher than 98% in the presence of both internal and external electron donors. Moreover, temperature rising elution fractionation method was used to understand the influence of donors and H₂ on the properties of the PP products.
- Polypropylene,
- Ziegler-Natta catalyst,
- External donor,
- Internal donor,
- Kinetic curves
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